Yoke and yoke-screw.



PATENTED MAY 21, 190'7.

v o. T. MAPES.. YoKE AND YoKE SCREW. APPLIGATIOIIl FILED SEPT. 21.1906.

UNITED sTATns PATENT CFFIGE.

CLARENCE vT. MAPES, OF PITTSBUHRG, PENNSYLVANIA.

YOKE AND YOKE-SCREW.

Specification of Letters Patent.

Patented May 21, 1907.

Application filed September 21,1906. Serial No. 335,612.

ments in Yoke and Yoke-Screws, of whichthe y following is aspecification, reference being had therein to the accompanying drawing.

This invention relates. to yoke and yoke screws of novel constructionadapted for use in connection with that class of devices employed indrilling oil, gas and Artesian Wells known as temper screws."

One object of the invention is to provide a yoke and yoke screw of novelconstruction in combination with a temper screw, whereby the yoke-screwmay be locked against the split nut or temper screw box of the main orfeed screw and permit the operator or driller to let out or unscrew thefeed screw as the progress of drilling requires.

A further object of this invention is to provide a temper screw yoke inwhich the threaded portion which alone is subject to wear, may beconveniently and economically replaced.

A further object of the invention is to provide a yoke and yoke screw inwhich the wear on the threaded portion of the yoke screw and thethreaded nut in the yoke is compensated for by theoutward movement of acone-shaped sectional nut in the taperbored portion of the yoke.

The construction of the improvement will be fully described hereinafterin connection with the accompanying drawing which fo'rms .a part of thisspeciiication, and its novel features will be deiined in the appendedclaims.

In the drawing, Figure l is a side elevation of a temper screw and reinspartly broken away with my improved yoke in position thereon, Fig. 2 isa horizontal section on the line :z2-x of Fig. 1 showing the normalposition of the yoke, screw firmly clamping the split nut on the mainscrew, Fig. 3 is a similar view showing the yoke screw released fromcontact with the split nut, and Fig. 4 is a section on the line y-y ofFig. 2.

The reference numeral l designates the main or feed screw extendingbetween the split nut 2 of the reins 3 and 4.

The yoke 5 is provided with a tapered bore 6 serving as a seat for aconical sectional nut 7 internally threaded to receive a yoke screw Sprovided at its outer end with a head 9.

The yoke 5 is secured to the split nut 2 by screws 10 and the conicalsectional nut 7 is adjustably secured within the tapered seat 6 `of theyoke by oppositely disposed screws 1l extending through the yoke andprojecting into diametrically opposite slots l2 formed in the sectionalnut 7.

The utility and operation of the device constructed as thus describedwill be readily understood. The inward movement of the yoke screw tendsto force the conical nut 7 into tight frictional engagement with thetapered seat. 6 ofthe yoke thus compressing the threaded portions of theconical nut into the threads of the yoke-screw 8 iirmly locking thedevice. The yoke screw firmly clamps the split nut 2 against the feedscrew. To release the yoke screw from the split nut 2 the yoke screw isturned back or unscrcwed a short distance from the nut 2, after which ablow with the hand or lever at the point a will release the engagementof the coneshaped sectional nut with the tapered bore of the yoke. Theyoke screw is then turned back a suiiicient distance to permit theentire disengagement of the nut members 2 from the main screw l allowingthe operator to elevate or pass upward the entire length of the mainscrew which has been turned or fed out. The yoke screw is then againadjusted to the position shown in Fig. 2.

What I claim and desire to secure by Letters Patent, is :h

1. A yoke for temper screws provided with a tapered seat, in combinationwith a sectional tapered nut within said seat, means for limiting themovement of said nut sections within said seat, and a yoke-screwextending through said sectional nut.

2. The combination with a temper screw and its reins, of a yokeencompassing the reins and provided with a tapered seat, a sectionalconical nut within said seat, a yokescrew extending through said nut,and means for limiting the movement of the sections of said nutcomprising oppositely disposed screws projecting into slots in saidsections.

3. The combination with a temper-screw, and its reins, of a yokeembracing said screw and reins, andsecured to the latter, a taperingseat at one end of said yoke, a sec- IOO ' and its reins, ot a yokehaving a tal ered seat tional conical nut and a screw extending oppositescrews extending through the Walls 1o through said ynut to impingeagainst the adof the tapered seat, and into elongated slots jacent reinmember. in the sectional nut.

4. The combination With. a temper screw, In testimony whereof I affix mysignature in the presence of tWo Witnesses. V-

CLARENCE T. MAPES.

at one end, a sectional conical nut tting said seat, a yoke screwextending through said Witnesses:

conical nut, and means for limiting the move- H. C. EVERT,

ment of said nut comprising diametrically MAX H. SRoLoVITZ.

